Which of the following are true about silicones? (A) They are formed by hydrolysis of \( R_{2} \...

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Which of the following are true about silicones?
(A) They are formed by hydrolysis of \( R_{2} \mathrm{SiCl}_{2} \)
(B) They are polymer, made up of \( R_{2} \mathrm{SiO}_{2} \) units
(C) They are made up of \( \mathrm{SiO}_{4}^{4-} \) units
(D) They are macromolecules
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